[ GLSA 200904-05 ] ntp: Certificate validation error

[Pierre-Yves Rofes <py () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200904-05
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: ntp: Certificate validation error
      Date: April 05, 2009
      Bugs: #254098
        ID: 200904-05

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Synopsis
========

An error in the OpenSSL certificate chain validation in ntp might allow
for spoofing attacks.

Background
==========

ntp contains the client and daemon implementations for the Network Time
Protocol.

Affected packages
=================

    -------------------------------------------------------------------
     Package       /  Vulnerable  /                         Unaffected
    -------------------------------------------------------------------
  1  net-misc/ntp     < 4.2.4_p6                           >= 4.2.4_p6

Description
===========

It has been reported that ntp incorrectly checks the return value of
the EVP_VerifyFinal(), a vulnerability related to CVE-2008-5077 (GLSA
200902-02).

Impact
======

A remote attacker could exploit this vulnerability to spoof arbitrary
names to conduct Man-In-The-Middle attacks and intercept sensitive
information.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All ntp users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/ntp-4.2.4_p6"

References
==========

  [ 1 ] CVE-2008-5077
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5077
  [ 2 ] CVE-2009-0021
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0021
  [ 3 ] GLSA 200902-02
        http://www.gentoo.org/security/en/glsa/glsa-200902-02.xml

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200904-05.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security () gentoo org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2009 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

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